在培育新品种过程中能够实时掌握了解土壤中植物根系的形态以及其生长情况将为植物学家提供很多不可或缺的信息.对基于micromegas探测技术的中子CT在这一新应用的试验环境进行了仿真模拟,通过三维图像重建后,得到了令人满意的预期结果.首先通过Geant4和Garfield模拟计算利用聚乙烯薄膜作为中子转换层的micromegas中子探测器,得到了非常理想的位置分辨,说明基于micromegas探测技术建立中子CT照相系统的可行性.然后利用MCNP仿真模拟14 MeV中子CT的实验环境,最后由Mat-lab程序进行图像重建.
In this paper,the possibility using mieromegas(Micro-Mesh Gaseous Structure) as neu-tron detector in 14 MeV neutron computed tomography(CT) has been simulated.The results show that the micromegas neutron detector has high spatial resolution and is a good candidate for neutron radiography.The three-dimensional images of plant roots in soil are successfully and clearly obtained by the 14 MeV neutron CT with micromegas as a neutron detector.In the present simulation,MCNP is employed for 14 MeV neutron transport in the sample and Matlab for the 3-D photograph reconstruction.
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